Laptop Motherboard Diagnosis/Repair (Can't run on AC or recharge battery)

sigfrid

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Oct 6, 2013
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Hello everyone,

I have an old Dell inspiron 9300 that can no longer run on Adapter alone, nor recharge batteries, the LED doesn't wink when the AC is connected.
Here is the stupid thing that I've done to get to this condition, (please don't laugh at me :). My power adapter cord was damaged so I decided to get a longer cord and solder it; but I did the stupid error of reversing the electrical wires of the charger and tried to run the laptop using that, and of course it didn't work!
However, the laptop was still running OK on battery alone, so I guess it's the charging circuit that was damaged. I don't it's the power jack or something like that...

Is there a way to get it working again with AC without having to replace the whole motherboard? Since it's an old laptop.

Thank you!

 

sigfrid

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Oct 6, 2013
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Thanks for your answer!
yes we are talking about the wires between the adapter and the laptop. I used two wires like in here. But of course I reversed them :(
 

sigfrid

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Oct 6, 2013
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Yes there are 3 wires in my adapter too, but it was already working great with 2 wires only. I have also tried with another brand new adapter (which used to work in the past) but it didn't work.

Also, I don't think it's the power jack, I remember I have tested it with a multimeter. I believe it's a fuse or something like that.
 

siawosh

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Nov 15, 2013
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tanx u for replay...my english is not well but i hop you can help me to fix this
so can u help me witch on of these are my problem??
i have BEEB by multimeter on both side of "B" zone...
i changed that and fix the BEEB but when i plug Charger in, it's like frist Have BEEB...
can u help me if i change the IC and "B" can i repair that??
http://upload7.ir/images/66459545607868070575.jpg
 

siawosh

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Nov 15, 2013
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Hi, i checked PC7 and PQ4 , both have 19vDC . so ok , For B zone the capacitor don't Have Number:( Just Color , so this picture is for back of the board , i have Checked PL1 , but one of Resistor (PR10) i chacked is not number on Resistor (number on the R is 1000 but i checked is around 3000-4000) , can PR10 Or PL1 are just my problem?
http://upload7.ir/images/76655560961995156462.jpg
 

siawosh

Honorable
Nov 15, 2013
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yes, i have this problem , reversing the electrical wires of the charger and tried to run the laptop using that...
now i checked back of the board , i think PR10 or maybe PL1 is not normal , and CPU side of board i just have problem whit B zone , i chaged it and fixed , but when i plug charger in , again i have problem whit that...now i dont know whay!
 
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